text: /*
   * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #ifndef __EVENT_RECORDER_H__
  #define __EVENT_RECORDER_H__
  
  #include <map>
  #include <memory>
  #include <mutex>
  
  #include <ostream>
  #include <sstream>
  
  struct Event
  {
    std::string name;
    std::string tid;
    std::string ph; /* REQUIRED */
    std::string ts; /* REQUIRED */
  };
  
  struct DurationEvent : public Event
  {
    // TO BE FILLED
  };
  
  struct CounterEvent : public Event
  {
    std::map<std::string, std::string> values;
  };
  
  //
  // Record Event as Chrome Trace Event File Format
  //
  // Refrence: https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/edit
  //
  class EventRecorder
  {
  public:
    EventRecorder() = default;
  
  public:
    void emit(const DurationEvent &evt);
    void emit(const CounterEvent &evt);
  
  public:
    bool empty() { return _ss.str().empty(); }
    void writeToFile(std::ostream &os);
  
  private:
    std::mutex _mu;
    std::stringstream _ss;
  };
  
  #endif // __EVENT_RECORDER_H__
  